Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?


M10i Routing Engine RE-B-1800 Description

Figure 1: Routing Engine RE-B-1800
Routing Engine RE-B-1800

The Routing Engine RE-B-1800 has the following major components:

  • CPU—Runs Junos OS to maintain the router's routing tables and routing protocols. It has Intel’s single core Jasper Forest processor.

  • USB port—Provides a removable media interface through which you can install the Junos OS manually. Junos OS supports USB version 2.0.

  • DRAM—Provides storage for the routing and forwarding tables and for other Routing Engine processes.

  • CompactFlash card—Provides primary storage for software images, configuration files, and microcode. The CompactFlash card is field-replaceable.

  • Solid-state Disk (SSD)—Provides secondary storage for log files and memory dumps, and can reboot the system if the CompactFlash card fails. SSD is front-pluggable and hot-swappable.

  • Interface ports—The AUX, CONSOLE, and MGMT ports provide access to management devices. Each Routing Engine has one 10/100/1000-Mbps Ethernet port for connecting to a management network, and two asynchronous serial ports—one for connecting to a console and one for connecting to a modem or other auxiliary device.

  • EEPROM—Stores the serial number of the Routing Engine.

  • Reset button—Reboots the Routing Engine when pressed.

  • Online/Offline button—Takes the Routing Engine online or offline when pressed.

  • Real-time clock—Provides real-time integrated clock with batter backup for data retention.

  • Extractor handle—Used for inserting and extracting the Routing Engine.

  • Captive screws—Secure the Routing Engine in place.

  • Four LEDs—A green LED labeled STORAGE, a blue LED labeled MASTER, a red LED labeled FAIL, and a green LED labeled ONLINE indicate Routing Engine status.


For specific information about Routing Engine components (for example, the capacity of the SSD), issue the show chassis routing-engine command.

The router is shipped with the Junos OS preinstalled on the Routing Engine. There are three copies of software:

  • One copy on the CompactFlash card in the Routing Engine.

  • One copy on the SSD in the Routing Engine.

  • One copy on a USB flash drive that can be inserted into the slot on the Routing Engine faceplate.

The Routing Engine boots from the storage media in this order: the USB device (if present), then the CompactFlash card, then the SSD, then the LAN. Normally, the router boots from the copy of the software on the CompactFlash card.